Help me interpret this initWithBytes/memcpy crash log?
Help me interpret this initWithBytes/memcpy crash log?
- Subject: Help me interpret this initWithBytes/memcpy crash log?
- From: Jonathan del Strother <email@hidden>
- Date: Thu, 5 Jan 2006 17:59:29 +0000
I've seen a couple of these crashes submitted from users, and I can't
quite figure out what's going on. I'd greatly appreciate anyone's
help in translating the crash log.
The entire log can be found here - http://www.steelskies.com/
initWithBytesCrash.txt
OK, the crash point is here:
Thread 1 Crashed:
0 <<00000000>> 0xffff8ad8 __memcpy + 824 (cpu_capabilities.h:189)
1 com.apple.Foundation 0x928c2fa8 -[NSConcreteData
initWithBytes:length:copy:freeWhenDone:bytesAreVM:] + 404
2 com.apple.Foundation 0x928e93b0 +[NSData
dataWithBytes:length:] + 64
3 CoverFlow 0x0002e12c -[ArtSource artwork] + 812 (crt.c:355)
(...)
Basically, I'm reading images from mp3's ID3 tags, and have just got
a chunk of binary data from id3lib. I then create an NSData object
from the binary data using NSData dataWithBytes:length.
The thread state is :
Thread 1 crashed with PPC Thread State 64:
srr0: 0x00000000ffff8ad8 srr1:
0x000000000200d030 vrsave: 0x00000000ff000000
cr: 0x24000445 xer: 0x0000000020000007 lr:
0x00000000928c2fa8 ctr: 0x0000000000001a90
(...)
Now, according to Apple's crash reporter tech note (http://
developer.apple.com/technotes/tn2004/tn2123.html), since srr0==lr,
we've crashed while fetching instructions.
It's years since I've done much assembly, so I'm a little rusty and
struggling to interpret this. Why should it fail fetching the
instruction pointer for memcpy? And why is memcpy's library given as
<<00000000>>? 0xffff8ad8 sounds like a magic number to me, but I
can't find anything useful about it on Google.
Umm...I'm not sure where to go from here, so any pointers would be
massively appreciated.
Thanks
Jon
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